Lighting Systems: Diagnosis Chevrolet SSR I

Scan Tool Output Controls

Body Control Module (BCM) Scan Tool Output Controls

Scan Tool Data List

Body Control Module (BCM) Scan Tool Data List

Diagnostic Trouble Code (DTC) List

Diagnostic Trouble Code (DTC) List

Circuit Description

The body control module (BCM) supplies battery positive voltage to the reading lamps, instrument panel (I/P) compartment lamp, and both visor vanity mirror lamps. In the event that any of these lamps were to remain illuminated for more than 20 minutes with the ignition switch in the OFF position, the BCM will deactivate the inadvertent supply voltage circuit to prevent a total battery discharge condition.

Conditions for Running the DTC

The battery voltage must be between 9.0-16.0 volts.

Conditions for Setting the DTC

1. The inadvertent power supply voltage circuit to the reading lamps, I/P compartment lamp, and both visor vanity mirror lamps is shorted to ground for more than 1 second.
2. There is a loss of the rear fuse block TBC 4 battery supply voltage to the BCM for more than 1 second while one or more of the lamps in the inadvertent power supply voltage circuit have been activated.

Action Taken When the DTC Sets

The reading lamps, I/P compartment lamp, and both visor vanity mirror lamps will not operate.

Conditions for Clearing the MIL/DTC

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

Diagnostic Aids

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.

The battery voltage must be between 9.0-16.0 volts.

When the front fog lamp switch signal circuit is shorted to ground for approximately 15 minutes.

The fog lamps will not operate.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

1. Test the fog lamp switch for sticking in the ON position.
2. Perform a visual inspection for loose or poor connections at all related components. Refer to «Testing for Intermittent Conditions and Poor Connections»(ref-187796-S06167208922005090100000) in Wiring Systems.

DTC B2527

When the body control module (BCM) senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the front fog lamp switch, the BCM energizes the front fog lamp relay by grounding the front fog lamp relay control circuit. The front fog lamp indicator is also illuminated utilizing the same fog lamp relay control circuit.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a front fog lamp switch OFF command and the front fog lamp relay control circuit is shorted to ground.
2. When the BCM receives a front fog lamp switch ON command and the front fog lamp relay control circuit is shorted to voltage or open.

The front fog lamps will not operate or will remain always on.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

When the body control module (BCM) receives a class 2 message from the powertrain control module (PCM) requesting to illuminate the backup lamps, battery voltage is sent directly from the BCM through the backup lamp supply voltage circuit to the backup lamps.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a backup lamp request signal and the backup lamp supply voltage circuit is shorted to ground.
2. When the BCM is not receiving a backup lamp request signal and the backup lamp supply voltage circuit is open or shorted to voltage.

The backup lamps will not operate.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

When the body control module (BCM) senses a request for headlamp or daytime running lamp (DRL) illumination, the BCM sends a ground signal to the low beam relay through the low beam headlamp relay control circuit. The low beam headlamp relay will illuminate the low beam headlamps.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a command to illuminate the low beam headlamps and the headlamp low beam relay control circuit is open or shorted to voltage.
2. When the BCM does not receive a command to illuminate the low beam headlamps and the headlamp low beam relay control circuit is shorted to ground.

The low beam headlamps will not operate or will remain always on.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

When the body control module (BCM) receives a ground signal from the multifunction high beam or flash to pass (FTP) switch commanding to illuminate the high beam headlamps, the BCM will energize the high beam relay by grounding the high beam relay control circuit.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a high beam headlamp OFF command and the high beam headlamp relay control circuit is shorted to ground.
2. When the BCM receives a high beam headlamp ON command and the high beam headlamp relay control circuit is shorted to voltage or open.

The high beam headlamps will not operate or will remain always ON.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

When the body control module (BCM) receives a ground signal from the headlamp switch commanding to illuminate the park lamps, the BCM will energize the park lamp relay by grounding the park lamp relay control circuit.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a park lamp OFF command and the park lamplamp relay control circuit is shorted to ground.
2. When the BCM receives a park lamp ON command and the park lamp relay control circuit is shorted to voltage or open.

The park lamps will not operate or will remain always ON.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

The ambient light sensor is a light sensitive transistor that sends a variable voltage signal to the body control module (BCM) in response to the exterior light level. The BCM energizes the daytime running lamp (DRL) relays by grounding the DRL relay control circuits. The DRL operate when the ambient light sensor indicates daytime, the ignition switch is in the RUN position, the gear selector is not in the park or neutral position, and the parking brake is released.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM sends a DRL OFF command and one of the DRL relay control circuits are shorted to ground.
2. When the BCM sends a DRL ON command and one of the DRL relay control circuits are shorted to voltage or open.
3. When the DRL diode supply voltage circuit is shorted to ground.
4. When the battery positive supply voltage circuit is shorted to ground or open.

The DRL will not operate or will remain always ON.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the instrument panel controls illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position through the instrument panel lamps dimming control circuit to the instrument panel controls illumination lamps.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a instrument panel controls illumination lamp request signal and the instrument panel lamps dimming control circuit is shorted to ground.
2. When the BCM is not receiving a instrument panel controls illumination lamp request signal and the instrument panel lamps dimming control circuit is shorted to voltage or open.

The instrument panel controls illumination lamps will not operate or are always ON.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

The body control module (BCM) receives a ground signal from the door jamb or courtesy lamp switches requesting courtesy lamp illumination. When this occurs, the BCM directly sends a voltage through the courtesy lamp supply voltage circuit illuminating the courtesy lamps.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM receives a courtesy lamp illumination request signal and the courtesy lamp supply voltage circuit is shorted to ground.
2. When the BCM is not receiving a courtesy lamp illumination request signal and the courtesy lamp supply voltage circuit is shorted to voltage.
3. There is a loss of the rear fuse block TBC 3 battery supply voltage to the BCM for more than 1 second.

The courtesy lamps will not operate or are always ON.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

The body control module (BCM) directly sends a 5-volt reference voltage to the instrument panel (I/P) dimmer switch which is then adjusted based on the I/P dimmer switch position and returned as a low reference and a signal to the BCM. The BCM uses this signal to directly control the desired level of instrument panel illumination lamp intensity.

The battery voltage must be between 9.0-16.0 volts.

1. When the BCM monitors a low reference voltage of less than 4.5 volts.
2. When the BCM monitors a high reference voltage of greater than 5.5 volts.
3. When the BCM monitors a signal voltage of equal or greater than 4.86 volts for more than 1 second.

The instrument panel illumination lamp dimming will not operate.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

The body control module (BCM) monitors the ambient light sensor signal circuit in order to determine if the daytime running lights (DRL) or the auto headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor signal voltage is between 1.75 volts and 4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON depending upon the amount of light received by the sensor.

The system voltage must be between 9.0 and 16.0 volts.

1. When the ambient light sensor signal voltage is less than 1.75 volts.
2. When the ambient light sensor signal voltage is more than 4.9 volts.

The ALC will remain ON in any ambient light state.

1. This DTC will clear immediately after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. Use a scan tool in order to clear history and current DTCs.

The body control module (BCM) monitors the park lamp switch signal circuit and the headlamp switch headlamps on signal circuit in order to determine when the park lamps and headlamps should be illuminated. When the headlamp switch is turned to PARK, the BCM senses that the park lamp switch signal circuit is grounded and the headlamps switch headlamps on signal circuit is open. The BCM will then energize the park lamp relay illuminating the park lamps. When the headlamp switch is turned to HEAD, the BCM senses that the park lamp switch signal circuit and the headlamp switch headlamps on signal circuit are grounded. The BCM will then energize the park lamp relay and headlamp driver module (HDM) illuminating the park lamps and headlamps.

The battery voltage must be between 9.0-16.0 volts.

When the BCM receives the headlamps ON signal request without a park lamp ON signal request from the headlamp switch.

The park lamps will not operate or the headlamps will illuminate without the park lamps.

1. This DTC will clear on current status after the condition for setting the fault is corrected.
2. A history DTC will clear after 100 consecutive ignition cycles without a fault present.
3. History and current DTCs can be cleared using a scan tool.

DTC B3802

1. Perform the «Diagnostic System Check - Lighting Systems»(ref-187799-S38531993692005090100000) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following: «Exterior Lighting Systems Description and Operation»(ref-187799-S13027051512005090100000) «Interior Lighting Systems Description and Operation»(ref-187799-S38139314642005090100000)

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Lighting System. Refer to «Checking Aftermarket Accessories»(ref-187796-S08905438042005090100000) in Wiring Systems.
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Backup Lamps Always On»(ref-187799-S37549566662005090100000)
2. «Backup Lamps Inoperative»(ref-187799-S34012287222005090100000)
3. «Courtesy Lamps Always On»(ref-187799-S09733997642005090100000)
4. «Courtesy Lamps Always On»(ref-187799-S09733997642005090100000)
5. «Courtesy Lamps Inoperative»(ref-187799-S14119416012005090100000)
6. «Daytime Running Lamps (DRL) Always On»(ref-187799-S01463890542005090100000)
7. «Daytime Running Lamps (DRL) Inoperative»(ref-187799-S37072818192005090100000)
8. «Fog Lamp Indicator Inoperative»(ref-187799-S33566155382005090100000)
9. «Fog Lamps Always On»(ref-187799-S06867172012005090100000)
10. «Fog Lamps Inoperative»(ref-187799-S21656723742005090100000)
11. «Hazard Lamps Always On»(ref-187799-S27342322332005090100000)
12. «Hazard Lamps Inoperative»(ref-187799-S25371297392005090100000)
13. «Headlamps Always On - Low or High Beam»(ref-187799-S08697011092005090100000)
14. «Headlamps Inoperative - High Beams»(ref-187799-S24488167102005090100000)
15. «Headlamps Inoperative - Low Beams»(ref-187799-S33779214212005090100000)
16. «Headlamps Inoperative - Flash to Pass»(ref-187799-S35629302822005090100000)
17. «High Beam Indicator Always On»(ref-187799-S00034144792005090100000)
18. «High Beam Indicator Inoperative»(ref-187799-S01531722302005090100000)
19. «Interior Backlighting Does Not Dim»(ref-187799-S08400637422005090100000)
20. «Interior Backlighting Inoperative»(ref-187799-S33912633132005090100000)
21. «Instrument Panel (I/P) Compartment Lamp Inoperative»(ref-187799-S25736885102005090100000)
22. «Instrument Panel (I/P) Compartment Lamp Always On»(ref-187799-S06380005452005090100000)
23. «License Lamps Inoperative»(ref-187799-S15551935882005090100000)
24. «Marker Lamps Inoperative»(ref-187799-S38814201152005090100000)
25. «Park Lamps Inoperative»(ref-187799-S28471421042005090100000)
26. «Stop Lamps Always On»(ref-187799-S16269357932005090100000)
27. «Stop Lamps Inoperative»(ref-187799-S09147566902005090100000)
28. «Tail Lamps Inoperative»(ref-187799-S03003742322005090100000)
29. «Tail, Marker, and License Lamps Always On»(ref-187799-S12527524462005090100000)
30. «Tail, Marker, and License Lamps Inoperative»(ref-187799-S25104599072005090100000)
31. «Turn Signal Lamps and/or Indicators Always On or Flashing»(ref-187799-S22622628462005090100000)
32. «Turn Signal Lamps and/or Indicators Inoperative»(ref-187799-S02848248402005090100000)
33. «Vanity Mirror Lamp(s) Inoperative»(ref-187799-S18149139302005090100000)